I am going to the Big Island of Hawaii soon and wanted to find out advice on what footwear I need to bring along. We plan to explore the volcanic areas, and everyone keeps insisting that we bring hiking boots. I haven't used my hiking boots in years since I've gone minimalist. Will I be okay with my Vibram Five Fingers or Merrell Trail Gloves or do I really need something with a thicker sole for the sharp, jagged rocks that everyone is telling us about? My plan is to simply bring flip flops for the pools/beach, Vibram's for day-to-day use, and Merrell Trail Gloves for any more difficult hiking. I figured I might as well post here because I don't know where else to go.